@article{Box-Steffensmeier:2018,
title={Modeling Unobserved Heterogeneity in Social Networks with the Frailty Exponential Random Graph Model},
volume={26},
DOI={10.1017/pan.2017.23},
number={1},
journal={Political Analysis},
publisher={Cambridge University Press},
author={Box-Steffensmeier, Janet M. and Christenson, Dino P. and Morgan, Jason W.},
year={2018},
pages={3–19}
}